Worksheet 545 · Skill 5

Set and drift

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1. At 1455 your fix is 349°T, 1.7 nm from Mill stack. You steer 056°T at 7.0 kn through the water. At 1545 a new fix puts you 124°T, 1.6 nm from Tern Island tower.

   Plot the 1545 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1115 your fix is 071°T, 4.9 nm from Tern Island tower. You steer 199°T at 8.9 kn through the water. At 1145 a new fix puts you 130°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1145 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1540 your fix is 045°T, 2.5 nm from Mill stack. You steer 294°T at 5.5 kn through the water. At 1650 a new fix puts you 053°T, 1.5 nm from Heron Point Light.

   Plot the 1650 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1250 your fix is 043°T, 3.3 nm from Heron Point Light. You steer 001°T at 4.1 kn through the water. At 1345 a new fix puts you 315°T, 3.1 nm from Tern Island tower.

   Plot the 1345 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0740 your fix is 075°T, 2.4 nm from Tern Island tower. You steer 294°T at 4.9 kn through the water. At 0830 a new fix puts you 338°T, 2.1 nm from Tern Island tower.

   Plot the 0830 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0845 your fix is 070°T, 4.9 nm from Tern Island tower. You steer 217°T at 7.0 kn through the water. At 0915 a new fix puts you 054°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 0915 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1025 your fix is 296°T, 3.7 nm from Tern Island tower. You steer 196°T at 4.0 kn through the water. At 1120 a new fix puts you 075°T, 2.6 nm from Westfield church spire.

   Plot the 1120 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0715 your fix is 217°T, 2.6 nm from Tern Island tower. You steer 071°T at 7.6 kn through the water. At 0755 a new fix puts you 040°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 0755 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn